Reference Id starts from DT having trouble in forming teams

Im unable to form teams with my friends having reference no. starts from CT but also i dont want to delete my account is it not possible to change reference no from DT to CT

Some context or background of this question would help us understand what exactly is the problem. Which account are you talking about? What is CT and DT and which reference ID are you talking about. 

Requesting you to add all the appropriate details to your question.